No offense taken at all, I may well be doing something really stupid. I did try to click on the measuring tool again. But like the other menu icons it won't take. It is like the screen is stuck in some other mode. When I click on an icon, it is the same as if clicking on the map behind it. For example I can click the measuring tool icon with the middle mouse button and drag and it measure the distance to a point behind the icon to wherever I drag to. If that makes sense.